Which nucleus completes the following equation? Please ignore the answer I chose, it might be wrong

D.

Explanation:

The given nuclear equation is the beta decay of chorine in which an electron, known as a beta particle, is given off from within the nucleus due to the breakdown of a neutron within the nucleus into a proton and a beta particle, such that the atomic number is increased by 1 from 17 to 18, which is the atomic number or argon, Ar, as follows;

3. dark matter

empty space could also be a simple vacuum

the right answer is 0.3 meters per second